Random sampler adapted to one-dimension slow-varying signal

A random sampler adapted to a one-dimension slow-varying signal, comprising:

• a signal preprocessing unit, a slope-controllable sawtooth wave signal generating unit, a signal comparing unit, a counting unit and a signal outputting unit, wherein
• the signal preprocessing unit is configured to preprocess an input signal and to transmit the preprocessed input signal to the signal comparing unit,
• the slope-controllable sawtooth wave signal generating unit is configured to generate a slope-controllable sawtooth wave signal, which is transmitted to the signal comparing unit, and to perform zero-resetting,
• the signal comparing unit is configured to compare the preprocessed input signal from the signal preprocessing unit with the sawtooth wave signal generated by the slope-controllable sawtooth wave signal generating unit and to output a pulse signal to the slope-controllable sawtooth wave signal generating unit and the signal outputting unit when the preprocessed input signal is equal to the sawtooth wave signal,
• the counting unit is configured to count a number of clock signals while the sawtooth wave signal generating unit is generating the sawtooth wave signal and to transmit the counted number to the signal outputting unit, and
• the signal outputting unit is configured to, upon receipt of the pulse signal output from the signal comparing unit, output the number counted by the counting unit at the moment.